<template>
<el-container class="home-container">
    <!-- 头部区域 -->
    <el-header>
        <div>
            <img src="../assets/heima.png" alt="">
            <span>电商后台管理系统</span>
        </div>
        <el-button type="info" @click="logout">退出</el-button></el-header>
    <!-- 页面主体区域 -->
<el-container>
    <!-- 侧边栏 -->
    <el-aside :width="isCollapse ? '64px' : '200px'">
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <!-- 侧边栏菜单区域 -->
    <el-menu background-color="#333744" text-color="#fff"
    active-text-color="#409EFF" unique-opened :collapse="isCollapse"
    :collapse-transition="false" router 
    :default-active="activePath">
    <!-- 一级菜单 -->
    <el-submenu :index="item.id + ''" v-for="item in menulist" :key="item.id">
        <!-- 一级菜单的模块区域 -->
        <template slot="title">
        <!-- 图标 -->
        <i :class="iconsObj[item.id]"></i>
        <!-- 文本 -->
        <span>{{item.authName}}</span>
        </template>
        <!-- 二级菜单 -->
        <el-menu-item :index="'/' + subItem.path" v-for="subItem in item.children" 
        :key="subItem.id" @click="saveNavState('/' + subItem.path)">
        <template slot="title">
        <!-- 图标 -->
        <i class="el-icon-location"></i>
        <!-- 文本 -->
        <span>{{subItem.authName}}</span>
        </template>
        </el-menu-item>
        </el-submenu>
    </el-menu>
</el-aside>
    <!-- 右侧内容主体 -->
    <el-main>
    <!-- 路由占位符 -->
    <router-view></router-view>
    </el-main>
    </el-container>
    </el-container>

</template>

<script>
export default {
    data() {
        return {
            // 左侧菜单数据
            menulist: [],
            iconsObj: {
                '125': 'iconfont icon-user',
                '103': 'iconfont icon-tijikongjian',
                '101': 'iconfont icon-shangpin',
                '102': 'iconfont icon-danju',
                '145': 'iconfont icon-baobiao' 
            },
            // 是否折叠
            isCollapse: false,
            // 被激活的链接地址
            activePath: ''
        };
    },
    created() {
        this.getMenuList()
        this.activePath = window.sessionStorage.getItem('activePath')
    },
    methods: {
        logout() {
            // 清空token
            window.sessionStorage.clear()
            // 跳转到登录页
            this.$router.push("/login")
        },
        // 获取所有的菜单
        async getMenuList() {
            const {data: res} = await this.$http.get('menus')
            if(res.meta.status !== 200) return this.$message.error(res.meta.msg)
            this.menulist = res.data
            console.log(res);
        },
        // 点击按钮，切换菜单的折叠与展开   
        toggleCollapse() {
            this.isCollapse = ! this.isCollapse
        },
        // 保存连接的激活状态
        saveNavState(activePath) {
            window.sessionStorage.setItem('activePath',activePath)
            this.activePath = activePath
        }
    },
};
</script>

<style lang="less" scoped>
.home-container {
    height: 100%;
}
.el-header {
    background-color: #373d41;
    display: flex;
    justify-content: space-between;
    padding-left: 0;
    align-items: center;
    color: #fff;
    font-size: 1.25rem;
    > div {
        display: flex;
        align-items: center;
        span {
            margin-left: .9375rem;
        }
    }
}
.el-aside {
    background-color: #333744;
    .el-menu {
        border-right: none;
    }
}
.el-main {
    background-color: #eaedf1;
}

.iconfont {
    margin-right: 10px;
}

.toggle-button {
    background-color: #4A5064;
    font-size: 10px;
    line-height: 24px;
    color: #fff;
    text-align: center;
    letter-spacing: 0.2em;
    cursor: pointer;
}
</style>